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| Effect of different ores on water quality adjustment of seawater desalinated by reverse osmosis |
| CHEN Hong1, YANG Xu1, ZHAO Liqin1, XU Bailong2, GAN Shu2, YANG Yueping1 |
1. Institute of Environmental Engineering, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Chimey Environmental Science & Technology Co. Ltd., Hangzhou 310030, China |
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Abstract In many places, reverse osmosis seawater desalination plays an important role in solving freshwater crisis. In spite of its superior quality, instability of desalinated water may be corrosive to water distribution systems, thus may pose a threat on human health. To solve this problem, four ores were used to adjust the quality of the desalinated water. The physical and chemical properties of maifanshi, dolomite, limestone and an imported ore, including composition, XRD(X-ray Diffraction), porosity and pore size distribution, surface morphology were analyzed. Based on these properties, the effects of the four ores on water quality adjustment of the desalinated water by reverse osmosis were studied. The results indicate that the porosity and dissolution of the imported ore are improved obviously after the artificial process. The hardness, alkalinity, Mg2+ contents of the import ore are 50% higher than any other ores, while the pH value of the effluent is too high, the Ca2+ content in the effluent is lower than that of limestone. Still, there is a certain gap compared with the tap water. In the future, research should focus on the development of modifying agents with large surface areas and faster dissolution rate, which can adjust the desalinated water without acidifying the influent.
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Published: 12 March 2016
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不同矿石对反渗透淡化水的调质效果研究
反渗透海水淡化已成为解决淡水危机的一种有效方法,但反渗透淡化水的化学稳定性差,使用过程中会腐蚀管网,作为饮用水存在一定的健康风险.采用溶解矿石法对反渗透淡化水的水质进行调节.对麦饭石、白云石、石灰石、进口矿石的理化性能(包括成分、物相组成、孔隙率及孔径分布、表面形态)进行了分析,并在此基础上对比分析了4种矿石对反渗透淡化水的调质效果.结果表明,进口矿石经人为加工后孔隙增多,溶出速率明显变快,调质后出水的硬度、碱度、Mg2+质量分数均高出其他3种原矿石50%以上,但其出水pH值过高,Ca2+质量分数低于石灰石,与自来水相比仍有一定差距,未来应致力于研制一种比表面积大、溶解速率快、无需对淡化水酸化而直接调质的调质剂.
关键词：
反渗透淡化水,
调质,
溶解矿石
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[1] RUAN Guoling. Design of Seawater Desalination Project[M].Beijing:China Electric Power Press,2013.
[2] SONNEBORN M, MANDELKOW J, SCHON D, et al. Health effects of inorganic drinking water constituents, including hardness, iodide, and fluoride[J]. CRC Critical Reviews in Environmental Control,1983,13(1):1-23
[3] DELION N, MAUGUIN G, CORSIN R. Importance and impact of post treatments on design and operation of SWRO plants[J]. Desalination,2004,165:323-334.
[4] GLUECKSTERN P, PRIEL M, KOTZER E. Blending brackish water with desalted seawater as an alternative to brackish water desalination[J]. Desalination,2005,178:227-232.
[5] SHEMER H, HASSON D, SEMIAT R. State-of-the-art review on post-treatment technologies[J]. Desalination,2015,356:285-293.
[6] XIAO Yuxiu. Experimental Study on Process Coupled with Carbon Dioxide and Limestone Bed Contactor to Improve Water Chemical Stability[D]. Changsha:Hunan University,2012.
[7] LIU Hongwei. Remineralization of Desalinated Seawater[D]. Tianjing:Tianjing University,2012.
[8] BIRNHACK L, FRIDMAN N, LAHAV O. Potential applications of quarry dolomite for post treatment of desalinated water[J]. Desalination,2009(1):58-67.
[9] MAITRA S, CHOUDHURY A. Effect of compaction on the kinetics of thermal decomposition of dolomite under non-isothermal condition[J]. Journal of Materials Science,2005,40:4749-4751.
[10] LI Juan, ZHANG Panyue, GAO Ying, et al. Overview of maifanshi:Its physi-chemical properties and nutritious function in drinking water[J].Environmental Science & Technology,2008,31(10):63-66.
[11] LEHMANN O, BIRNHACK L, LAHAV O. Design aspects of calcite-dissolution reactors applied for post treatment of desalinated water[J]. Desalination,2013,314:1-9.
[12] HOU Yue.Military Hygiene[M]. Beijing:People's Medical Press,1998.
[13] CHEN Miaomiao, LIU Chuanfei, LI Xumei. Total hardness of running water in Hangzhou and its impact on human health[J]. Foreign Medical Science Section of Medgeography,2010,31(4):224-225.
[14] LI Yong, ZHONG Gemei, HUANG Jiangping, et al. Analysis on total hardness of drinking water in Guangxi rural areas in 2008-2012[J]. Journal of Environmental Hygiene,2014,4(3):259-261.
[15] JIA Zhongjian, QIAO Yihua, NIAN Zhihong, et al. Analysis on total hardness of drinking water in Pingliang rural areas in 2009-2011[J]. Chin J of Public Health Eng,2015,14(4):380-381.
[16] YOU Guangfu, FAN Song, CHANG Yuhong. Analysis on the monitoring of running water quality in Luxian township between 2007 and 2010[J]. Modern Preventive Medicine,2013,40(6):1170-1172.
[17] LIU Miao, FANG Aiping, SHI Haoyu. Analysis of calcium content in drinking water in some areas of China[J].For all Health,2015,9(8):20-21.
[18] SARIN P, CLEMENT J, SNOEYINK V, et al. Iron release from corroded, unlined cast-iron pipe[J]. American Water Works Association,2003(1):85-96.
[19] LARSON T,KING R. Corrosion by water at low flow volocity[J].American Water Works Association,1954,46(1):3-9.
[20] DIN A M S E. Three strategies for combating the corrosion of steel pipes carrying desalinated potable water[J]. Desalination,2009,238(1/2/3):166-173.
[21] LI Yongxin, FANG Bin. Calculating the soluble point and pH in calcium carbonate water by drawing figure[J]. Journal of Anhui Normal University:Natural Science,1999,22(1):82-83. |
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